Help with character name?

So, I recently started a story, which seems to be turning into a novel. So far, I've got three main characters, and two others (don't have much to do with plot). My very first main character is a female. She doesn't talk, has long black hair (which she carelessly throws in a pony tail), is always either angry or emotionless, and is intimidating. She's the one I need a name for. The whole story is set sometime in the future, if that helps. My next main character is the assigned partner to the girl, his name is Brian Shirley. I couldn't think of another last name, but Brian suits him perfectly. My final main character is Ms. Culligan, their boss and president of the government. I don't want to give away much of the plot line, but it's an action type of story, and possibly a bit of romance. Their (the girl's and Brian's) job is to exterminate magical creatures, so they don't hurt humans. Brian hates it, but the girl is apathetic. She's also very independent; when Ms. Culligan assigned Brian to her, she hated it and glares at him a lot. Oh yeah, Brian calls the girl "Agent X" just to annoy her. :D He's easygoing, lighthearted, and friendly, so he's just annoying her in a playful way. Yeah, so I guess that should be good enough. I've searched in so many places for a name for "Agent X", but there's no name I can find. I considered Raven for a second, then trashed the idea. I've also considered Raina and Phoenix, but they just don't match. ACK! Any help will be appreciated.